As Obama points out, there are many places around the world where girls don't necessarily receive the same treatment. She writes:

In some places, girls are viewed as less worthy of an education than boys, so when a family has limited funds, they’ll educate their sons instead of their daughters. In some parts of the world, girls are forced to get married young – sometimes before they even reach puberty – to men who might be three or four times their age, and instead of attending school, they wind up having children at a young age.

I know that your school might not be as good as it should be, or you might be facing challenges in your family that make it hard for you to focus in class. But if girls across the globe can walk hours each day from their villages to attend school, or work two or three jobs to pay their school fees, or even risk their lives to attend school, then I know you can overcome any obstacles you face.